What is an “Unrestricted Submarine Warfare”? ( In your own words )

You literally should be able to tell by context it's what it sounds like...

Explanation:

Unrestricted submarine warfare is a type of naval warfare in which submarines sink vessels such as freighters and tankers without warning, as opposed to attacks per prize rules (also known as "cruiser rules").

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answer; i do believe its (b) 12.5 years of age;

what is the answer